md5crypt.java

struts+spring+hibernate自创框架

package com.pegasus.framework.util.security;

import java.security.MessageDigest;

public final class MD5Crypt {

	private final static String[] hexDigits = { "0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "a", "b", "c", "d", "e", "f" };

	/**
	 * 转换字节数组为16进制字串
	 * 
	 * @param b
	 * 字节数组
	 * @return 16进制字串
	 */
	public static String byteArrayToString(byte[] b) {
		StringBuffer resultSb = new StringBuffer();
		for (int i = 0; i < b.length; i++) {
			 resultSb.append(byteToHexString(b[i]));//若使用本函数转换则可得到加密结果的16进制表示，即数字字母混合的形式
			//resultSb.append(byteToNumString(b[i]));// 使用本函数则返回加密结果的10进制数字字串，即全数字形式
		}
		return resultSb.toString();
	}

	private static String byteToNumString(byte b) {

		int _b = b;
		if (_b < 0) {
			_b = 256 + _b;
		}

		return String.valueOf(_b);
	}

	private static String byteToHexString(byte b) {
		int n = b;
		if (n < 0) {
			n = 256 + n;
		}
		int d1 = n / 16;
		int d2 = n % 16;
		return hexDigits[d1] + hexDigits[d2];
	}

	public static String MD5Encode(String origin) {
		String resultString = null;

		try {
			resultString = new String(origin);
			MessageDigest md = MessageDigest.getInstance("MD5");
			resultString = byteArrayToString(md.digest(resultString.getBytes()));
		} catch (Exception ex) {

		}
		return resultString;
	}

	public static void main(String[] args) {
		MD5Crypt md5encrypt = new MD5Crypt();
		System.out.println(MD5Encode("admin"));
		
		
	}

}